hugo content 源码
hugo content 代码
文件路径：/tpl/internal/go_templates/htmltemplate/content.go
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package template
import (
"fmt"
htmltemplate "html/template"
"reflect"
)
type contentType uint8
const (
contentTypePlain contentType = iota
contentTypeCSS
contentTypeHTML
contentTypeHTMLAttr
contentTypeJS
contentTypeJSStr
contentTypeURL
contentTypeSrcset
// contentTypeUnsafe is used in attr.go for values that affect how
// embedded content and network messages are formed, vetted,
// or interpreted; or which credentials network messages carry.
contentTypeUnsafe
)
// indirect returns the value, after dereferencing as many times
// as necessary to reach the base type (or nil).
func indirect(a any) any {
if a == nil {
return nil
}
if t := reflect.TypeOf(a); t.Kind() != reflect.Pointer {
// Avoid creating a reflect.Value if it's not a pointer.
return a
}
v := reflect.ValueOf(a)
for v.Kind() == reflect.Pointer && !v.IsNil() {
v = v.Elem()
}
return v.Interface()
}
var (
errorType = reflect.TypeOf((*error)(nil)).Elem()
fmtStringerType = reflect.TypeOf((*fmt.Stringer)(nil)).Elem()
)
// indirectToStringerOrError returns the value, after dereferencing as many times
// as necessary to reach the base type (or nil) or an implementation of fmt.Stringer
// or error,
func indirectToStringerOrError(a any) any {
if a == nil {
return nil
}
v := reflect.ValueOf(a)
for !v.Type().Implements(fmtStringerType) && !v.Type().Implements(errorType) && v.Kind() == reflect.Pointer && !v.IsNil() {
v = v.Elem()
}
return v.Interface()
}
// stringify converts its arguments to a string and the type of the content.
// All pointers are dereferenced, as in the text/template package.
func stringify(args ...any) (string, contentType) {
if len(args) == 1 {
switch s := indirect(args[0]).(type) {
case string:
return s, contentTypePlain
case htmltemplate.CSS:
return string(s), contentTypeCSS
case htmltemplate.HTML:
return string(s), contentTypeHTML
case htmltemplate.HTMLAttr:
return string(s), contentTypeHTMLAttr
case htmltemplate.JS:
return string(s), contentTypeJS
case htmltemplate.JSStr:
return string(s), contentTypeJSStr
case htmltemplate.URL:
return string(s), contentTypeURL
case htmltemplate.Srcset:
return string(s), contentTypeSrcset
}
}
i := 0
for _, arg := range args {
// We skip untyped nil arguments for backward compatibility.
// Without this they would be output as <nil>, escaped.
// See issue 25875.
if arg == nil {
continue
}
args[i] = indirectToStringerOrError(arg)
i++
}
return fmt.Sprint(args[:i]...), contentTypePlain
}
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